Current Electri...

In a potentiometer experiment of a cell of emf 1.25 V gives balancing length of 30 cm. If the cell is replaced by another cell, balancing length is found to be 40 cm. What is the emf of second cell?

Four identical cells of emf $$E$$ and internal resistance $$r$$ are to be connected in series. Suppose if one of the cell is connected wrongly, the equivalent emf and effective internal resistance of the combination is

Resistance of $$2\ \Omega$$ and $$3\ \Omega$$ are connected in series. If the potential difference across the $$2\ \Omega$$ resistor is $$3\ V$$, the potential difference across $$3\Omega$$ is:

Two resistances are connected in series as shown in the diagram. What is the current through $$R$$?

Which of the following is true for carbon resistors?

Which of the following is not the advantage of Carbon resistors?

Copper and Germanium are cooled from room temperature to $$100 K$$. Then the resistance of 

A resistor of $$6 k\Omega $$ with tolerance $$10$$% and another of $$4k\Omega $$ with tolerance $$10$$% are connected in series. The tolerance of combination is about

The________ indicates the multiplier telling you the power of ten to which the two significant digits in color coding of the resistor  must be multiplied (or how many zeros to add).

Red,orange,black are the color bands on resistors.Find its resistance?